CN102533390A - Iron-based oxygen carrier with interlayer shell structure and capable of catalyzing direct combustion of coal, and preparation method for iron-based oxygen carrier - Google Patents
Iron-based oxygen carrier with interlayer shell structure and capable of catalyzing direct combustion of coal, and preparation method for iron-based oxygen carrier Download PDFInfo
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- CN102533390A CN102533390A CN201210035490XA CN201210035490A CN102533390A CN 102533390 A CN102533390 A CN 102533390A CN 201210035490X A CN201210035490X A CN 201210035490XA CN 201210035490 A CN201210035490 A CN 201210035490A CN 102533390 A CN102533390 A CN 102533390A
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Abstract
The invention belongs to the technical field of chemical-looping combustion and particularly relates to an iron-based oxygen carrier with an interlayer shell structure and capable of catalyzing direct combustion of coal, and a preparation method for the iron-based oxygen carrier. According to the oxygen carrier, nano alumina is used as a carrier, the active ingredient Fe2O3 is loaded on the surface of the nano alumina, a trace amount of vanadium complex is loaded on the outer surface of Fe2O3, and the Fe2O3 loaded with the vanadium complex is used as a catalyst, and the outmost layer is a SiO2 shell film with a cellular structure; in the embedded iron-based oxygen carrier with the interlayer shell structure, the mass ratio of the active ingredient Fe2O3 to the nano alumina is (1:19)-(1:1); and the Si-to-Fe atomic ratio in the SiO2 outer film and the active ingredient Fe2O3 is 0.5-1. According to the novel oxygen carrier, the active ingredient Fe2O3 is arranged between the carrier and the shell film, and the agglomeration possibility of the oxygen carrier is reduced due to the outer film. The iron-based oxygen carrier prepared by using the nano alumina as the carrier has an extremely specific area, the active ingredient Fe2O3 can be uniformly distributed on the surface of the carrier, and the reaction area is enlarged. Moreover, the carrier and the outer layer material are stable in performance at high temperature and do not react with Fe2O3, and the heat stability of the novel iron-based oxygen carrier is guaranteed.
Description
Technical field
The invention belongs to the chemical chain burning technology field, be specifically related to interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion and preparation method thereof.
Background technology
(Chemical-Looping Combustion, CLC) notion equals the nineteen eighty-three proposition by Richter to burning chemistry chains.Lyngfelt in 2004 etc. as the burning chemistry chains reactor drum, have realized CO with interconnected fluidized bed
2The interior separation.The CLC technology adopts the not direct and air catalytic combustion of fuel, transforms but react the chemical energy of realizing fuel with the cycle alternation of oxygen carrier between air reactor and fuel reaction device.Chemical chain burning technology is with its enrichment CO that has
2Characteristics and enjoy world scholar's concern.
The good physics and the oxygen carrier of chemical property are the keys of chemical chain burning technology.Estimate the oxygen carrier performance refer generally to indicate: reactivity, oxygen carrying capability, continue particle scale distribution, internal voids structure, price and the environmental-protecting performance etc. of circulation ability (life-span), the maximum temperature that can bear, physical strength (resisting fragmentation, antiwear property etc.), anti-sintering and anti-reunion ability, oxygen carrier.The main oxygen carrier of studying both at home and abroad at present has the oxide compound of transition metal such as Fe, Cu, Ni, Co, Mn, Cd, for specific surface area, physical strength and the thermostability that increases oxygen carrier also can add SiO
2, Al
2O
3, TiO
2, ZrO
2, MgO, yttria-stabilized zirconia (YSZ), sepiolite, kaolin, wilkinite and inert supports such as aluminium, magnesate.
The fuel that is used for burning chemistry chains can be geseous fuel (CO, CH
4, H
2Deng) and solid fuel (coal).China is energy consumption big country, and the coal resources reserves are abundant, and energy structure is main with coal, and the chemical chain burning technology of therefore studying solid fuel such as coal is significant.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing oxygen carrier, utilize Al
2O
3Fe
2O
3SiO
2The interlayer nucleocapsid structure, provide a kind of and have that catalytic capability, anti-caking power are strong, specific surface area big, Heat stability is good, Stability Analysis of Structures is indeformable and long service life be applied to iron-based oxygen carrier of coal direct combustion and preparation method thereof.
The technical scheme that the present invention adopted is:
This oxygen carrier is carrier with the nano aluminium oxide, activeconstituents Fe
2O
3Be carried on the surface of nano aluminium oxide, and at Fe
2O
3Outside surface load trace vanadium complex compound as catalyzer, outermost layer is the SiO of microvoid structure
2Enclosure film; Wherein, in said embedded type nucleocapsid structure iron-based oxygen carrier, activeconstituents Fe
2O
3With the mass ratio of nano aluminium oxide be (1: 19)～(1: 1), SiO
2Outer membrane and activeconstituents Fe
2O
3The atomic ratio of middle Si and Fe is 0.5～1.
" nuclear " refers to the carrier nano aluminium oxide in said " nucleocapsid structure ", and " shell " refers to the SiO of microvoid structure
2Outer membrane.
The preparation method of said catalysis coal direct combustion interlayer nucleocapsid structure iron-based oxygen carrier possesses following steps:
Step (1): measure an amount of molysite and be dissolved in the zero(ppm) water of capacity, the proper amount of nano alumina powder is put into above-mentioned solution,, ultrasonication for some time, stir the appropriate time after-filtration and collect filter residue with strong aqua volumetric soiutions PH to 9.0;
Step (2): the filter residue to obtaining in the step (1) carries out drying, roasting, promptly obtains the iron-based oxygen carrier based on nano aluminium oxide, and makes in the load-type iron-based oxygen carrier that obtains activeconstituents Fe
2O
3With the mass ratio of nano aluminium oxide be (1: 19)～(1: 1);
Step (3): measuring an amount of concentration is the ethanolic soln of the vanadium complex compound of 1.20mmol/L～1.30mmol/L, and the load-type iron-based oxygen carrier of preparation is put into wherein, leaves standstill 10～14h under 120 ℃;
Step (4): under the room temperature; The load vanadium complex compound iron-based oxygen carrier, deionized water and the concentration that in continue stirring, add a certain amount of ethanol, preparation in the beaker successively are the tetraethoxy of 0.2mol/L; Wherein the volume ratio of ethanol and deionized water is 4: 1, and adding an amount of concentration then is strong aqua catalysis teos hydrolysis, the condensation of 0.5mol/L; With the product spinning, make that the atomic ratio of Si and Fe is 0.5～1 behind the sealed reaction 6h.
Step (5): use ethanol and deionized water for several times respectively, and adopt air dry oven dry for some time under proper temperature, can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
Ultrasonic treatment time in the said step (1) is 1～5h, and churning time is 10h.
Drying in the said step (2) is that common air dry oven is dry, and drying temperature is 120 ℃, and be 10h time of drying; Maturing temperature is 550 ℃, and roasting time is 5h.
Drying temperature in the said step (5) is 120 ℃, and be 3h time of drying.
Said molysite is iron nitrate or iron(ic)chloride.
Beneficial effect of the present invention is:
Coal is being used for the burning chemistry chains process, and coal at first gasifies and generates CO, CH
4, H
2And inflammable gas such as some hydro carbons macromole gases, these inflammable gass react with oxygen carrier again.Hydro carbons macromole gas is nonflammable fully, but the vanadium complex compound catalyzed oxidation hydro carbons macromole gas in this oxygen carrier improves its speed of reaction, and then improves the utilising efficiency that is applied in the burning chemistry chains reaction.
Nano aluminium oxide has great specific surface area, and high temperature resistant, physical strength is big, thermal stability is high, the life-span is long.It as carrier, is helped activeconstituents Fe
2O
3Homodisperse, can more reaction area be provided for burning chemistry chains.In addition, outer field micropore SiO
2Film has reduced the possibility of reuniting between the adjacent oxygen carrier granule, helps repeatedly recycling of oxygen carrier.
Interlayer nucleocapsid structure iron-based oxygen carrier, activeconstituents Fe
2O
3Be embedded between carrier and the outer membrane, thereby avoided Fe
2O
3The loss that causes because of wearing and tearing.Carrier and outer membrane material are nonreactant, are difficult to and Fe under the high temperature
2O
3React, therefore can guarantee Fe
2O
3Can be because of with carrier and outer membrane generation addition reaction and lose.More than two aspects work-ing life of having guaranteed oxygen carrier.
Embodiment
The invention provides interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion and preparation method thereof, through specific embodiment the present invention is done further elaboration below.
Percentage composition in the following instance is weight percentage like no specified otherwise.
Embodiment 1
Based on the iron-based oxygen carrier of interlayer nucleocapsid structure, its preparation method is following:
Step (1): the iron nitrate of weighing 15.15g (Fe (NO
3)
39H
2O) be dissolved in the capacity zero(ppm) water, 7g nano aluminium oxide powder is put into above-mentioned solution, with strong aqua volumetric soiutions PH to 9.0, ultrasonication 5h stirs the 10h after-filtration and collects filter residue.
Step (2): the filter residue that obtains in the step (1) is placed 120 ℃ of common air dry ovens dry 10h, 550 ℃ of roasting 5h of retort furnace down, promptly obtain novel interlayer nucleocapsid structure iron-based oxygen carrier (Fe wherein
2O
3With the mass ratio of nano aluminium oxide be 3:7).
Step (3): measuring 10ml concentration is the ethanolic soln of the vanadium complex compound of 1.25mmol/L, and the load-type iron-based oxygen carrier of measuring 10g preparation is put into wherein, leaves standstill 12h under 120 ℃.
Step (4): under the room temperature; The tetraethoxy of 0.2mol/L that in continue stirring, adds iron-based oxygen carrier, 125ml deionized water and the 93.7ml of 500ml ethanol, 10g load vanadium complex compound in the beaker successively adds strong aqua catalysis teos hydrolysis, the condensation of an amount of 0.5mol/L then.Behind the sealed reaction 6h with product spinning (wherein the atomic ratio of Si and Fe is 0.5: 1).
Step (5): use ethanol and deionized water for several times respectively, and adopt 120 ℃ of following dry 3h of air dry oven can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
Adopt the small-sized fluidized bed simulated experiment platform of thermogravimetric analyzer and development voluntarily that the performance of above-mentioned oxygen carrier is tested.The employing shenfu coal is a fuel, and the efficiency of combustion in 600-1100 ℃ of scope is all very high.And through behind 30 circulating reactions, the reactive behavior of oxygen carrier and oxygen carrying capability have slightly and rise, and do not have tangible sintering phenomenon.
Embodiment 2
Based on the iron-based oxygen carrier of interlayer nucleocapsid structure, its preparation method is following:
Step (1): the iron nitrate of weighing 25.25g (Fe (NO
3)
39H
2O) be dissolved in the capacity zero(ppm) water, 5g nano aluminium oxide powder is put into above-mentioned solution, with strong aqua volumetric soiutions PH to 9.0, ultrasonication 5h stirs the 10h after-filtration and collects filter residue.
Step (2): the filter residue that obtains in the step (1) is placed 120 ℃ of common air dry ovens dry 10h, 550 ℃ of roasting 5h of retort furnace down, promptly obtain novel interlayer nucleocapsid structure iron-based oxygen carrier (Fe wherein
2O
3With the mass ratio of nano aluminium oxide be 1: 1).
Step (3): measuring 10ml concentration is the ethanolic soln of the vanadium complex compound of 1.25mmol/L, and the load-type iron-based oxygen carrier of measuring 10g preparation is put into wherein, leaves standstill 12h under 120 ℃.
Step (4): under the room temperature; The tetraethoxy of 0.2mol/L that in continue stirring, adds iron-based oxygen carrier, 125ml deionized water and the 250ml of 500ml ethanol, 10g load vanadium complex compound in the beaker successively adds strong aqua catalysis teos hydrolysis, the condensation of an amount of 0.5mol/L then.Behind the sealed reaction 6h with product spinning (wherein the atomic ratio of Si and Fe is 0.8: 1).
Step (5): use ethanol and deionized water for several times respectively, and adopt 120 ℃ of following dry 3h of air dry oven can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
Adopt the small-sized fluidized bed simulated experiment platform of thermogravimetric analyzer and development voluntarily that the performance of above-mentioned oxygen carrier is tested.The employing shenfu coal is a fuel, and the efficiency of combustion in 600-1100 ℃ of scope is all very high.And through behind 30 circulating reactions, the reactive behavior of oxygen carrier and oxygen carrying capability have slightly and rise, and do not have tangible sintering phenomenon.
Embodiment 3
Based on the iron-based oxygen carrier of interlayer nucleocapsid structure, its preparation method is following:
Step (1): the iron(ic)chloride (FeCl of weighing 10.1g
36H
2O) be dissolved in the capacity zero(ppm) water, 7g nano aluminium oxide powder is put into above-mentioned solution, with strong aqua volumetric soiutions PH to 9.0, ultrasonication 5h stirs the 10h after-filtration and collects filter residue.
Step (2): the filter residue that obtains in the step (1) is placed 120 ℃ of common air dry ovens dry 10h, 550 ℃ of roasting 5h of retort furnace down, promptly obtain novel interlayer nucleocapsid structure iron-based oxygen carrier (Fe wherein
2O
3With the mass ratio of nano aluminium oxide be 3:7).
Step (3): measuring 10ml concentration is the ethanolic soln of the vanadium complex compound of 1.25mmol/L, and the load-type iron-based oxygen carrier of measuring 10g preparation is put into wherein, leaves standstill 12h under 120 ℃.
Step (4): under the room temperature; The tetraethoxy of 0.2mol/L that in continue stirring, adds iron-based oxygen carrier, 125ml deionized water and the 93.7ml of 500ml ethanol, 10g load vanadium complex compound in the beaker successively adds strong aqua catalysis teos hydrolysis, the condensation of 0.5mol/L then.Behind the sealed reaction 6h with product spinning (wherein the atomic ratio of Si and Fe is 0.5: 1).
Step (5): use ethanol and deionized water for several times respectively, and adopt 120 ℃ of following dry 3h of air dry oven can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
Adopt the small-sized fluidized bed simulated experiment platform of thermogravimetric analyzer and development voluntarily that the performance of above-mentioned oxygen carrier is tested.The employing shenfu coal is a fuel, and the efficiency of combustion in 600-1100 ℃ of scope is all very high.And through behind 30 circulating reactions, the reactive behavior of oxygen carrier and oxygen carrying capability have slightly and rise, and do not have tangible sintering phenomenon.
Embodiment 4
Based on the iron-based oxygen carrier of interlayer nucleocapsid structure, its preparation method is following:
Step (1): the iron(ic)chloride (FeCl of weighing 16.9g
36H
2O) be dissolved in the capacity zero(ppm) water, 5g nano aluminium oxide powder is put into above-mentioned solution, with strong aqua volumetric soiutions PH to 9.0, ultrasonication 5h stirs the 10h after-filtration and collects filter residue.
Step (2): the filter residue that obtains in the step (1) is placed 120 ℃ of common air dry ovens dry 10h, 550 ℃ of roasting 5h of retort furnace down, promptly obtain novel interlayer nucleocapsid structure iron-based oxygen carrier (Fe wherein
2O
3With the mass ratio of nano aluminium oxide be 1: 1).
Step (3): measuring 10ml concentration is the ethanolic soln of the vanadium complex compound of 1.25mmol/L, and the load-type iron-based oxygen carrier of measuring 10g preparation is put into wherein, leaves standstill 12h under 120 ℃.
Step (4): under the room temperature; The tetraethoxy of 0.2mol/L that in continue stirring, adds iron-based oxygen carrier, 125ml deionized water and the 250ml of 500ml ethanol, 10g load vanadium complex compound in the beaker successively adds strong aqua catalysis teos hydrolysis, the condensation of 0.5mol/L then.Behind the sealed reaction 6h with product spinning (wherein the atomic ratio of Si and Fe is 0.8: 1).
Step (5): use ethanol and deionized water for several times respectively, and adopt 120 ℃ of following dry 3h of air dry oven can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
Adopt the small-sized fluidized bed simulated experiment platform of thermogravimetric analyzer and development voluntarily that the performance of above-mentioned oxygen carrier is tested.The employing shenfu coal is a fuel, and the efficiency of combustion in 600-1100 ℃ of scope is all very high.And through behind 30 circulating reactions, the reactive behavior of oxygen carrier and oxygen carrying capability have slightly and rise, and do not have tangible sintering phenomenon.
Claims (7)
1. the interlayer nucleocapsid structure iron-based oxygen carrier of a catalysis coal direct combustion is characterized in that, this oxygen carrier is carrier with the nano aluminium oxide, activeconstituents Fe
2O
3Be carried on the surface of nano aluminium oxide, and at Fe
2O
3Outside surface load trace vanadium complex compound as catalyzer, outermost layer is the SiO of microvoid structure
2Enclosure film; Wherein, in said embedded type nucleocapsid structure iron-based oxygen carrier, activeconstituents Fe
2O
3With the mass ratio of nano aluminium oxide be (1: 19)～(1: 1), SiO
2Outer membrane and activeconstituents Fe
2O
3The atomic ratio of middle Si and Fe is 0.5～1.
2. the interlayer nucleocapsid structure iron-based oxygen carrier of catalysis coal direct combustion according to claim 1 is characterized in that " nuclear " refers to the carrier nano aluminium oxide in said " nucleocapsid structure ", and " shell " refers to the SiO of microvoid structure
2Outer membrane.
3. the preparation method of the interlayer nucleocapsid structure iron-based oxygen carrier of catalysis coal direct combustion as claimed in claim 1 is characterized in that possessing following steps:
Step (1): measure an amount of molysite and be dissolved in the zero(ppm) water of capacity, the proper amount of nano alumina powder is put into above-mentioned solution,, ultrasonication for some time, stir the appropriate time after-filtration and collect filter residue with strong aqua volumetric soiutions PH to 9.0;
Step (2): the filter residue to obtaining in the step (1) carries out drying, roasting, promptly obtains the iron-based oxygen carrier based on nano aluminium oxide, and makes in the load-type iron-based oxygen carrier that obtains activeconstituents Fe
2O
3With the mass ratio of nano aluminium oxide be (1: 19)～(1: 1);
Step (3): measuring an amount of concentration is the ethanolic soln of the vanadium complex compound of 1.20mmol/L～1.30mmol/L, and the load-type iron-based oxygen carrier of preparation is put into wherein, leaves standstill 10～14h under 120 ℃;
Step (4): under the room temperature; The load vanadium complex compound iron-based oxygen carrier, deionized water and the concentration that in continue stirring, add a certain amount of ethanol, preparation in the beaker successively are the tetraethoxy of 0.2mol/L; Wherein the volume ratio of ethanol and deionized water is 4: 1, and adding an amount of concentration then is strong aqua catalysis teos hydrolysis, the condensation of 0.5mol/L; With the product spinning, make that the atomic ratio of Si and Fe is 0.5～1 behind the sealed reaction 6h.
Step (5): use ethanol and deionized water for several times respectively, and adopt air dry oven dry for some time under proper temperature, can obtain interlayer nucleocapsid structure iron-based oxygen carrier with centrifugal product cleaning.
4. the preparation method of the interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion according to claim 3 is characterized in that the ultrasonic treatment time in the said step (1) is 1～5h, and churning time is 10h.
5. the preparation method of the interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion according to claim 3 is characterized in that, the drying in the said step (2) is that common air dry oven is dry, and drying temperature is 120 ℃, and be 10h time of drying; Maturing temperature is 550 ℃, and roasting time is 5h.
6. the preparation method of the interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion according to claim 3 is characterized in that the drying temperature in the said step (5) is 120 ℃, and be 3h time of drying.
7. the preparation method of the interlayer nucleocapsid structure iron-based oxygen carrier of a kind of catalysis coal direct combustion according to claim 3 is characterized in that said molysite is iron nitrate or iron(ic)chloride.
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|---|---|---|---|---|
| CN103468029A (en) * | 2013-08-19 | 2013-12-25 | 铜陵瑞莱科技有限公司 | Preparation method of aluminum oxide coating film iron oxide black |
| GB2512334A (en) * | 2013-03-26 | 2014-10-01 | Gas Recovery & Recycle Ltd | Materials for use in chemical looping combustion |
| CN105780087A (en) * | 2014-12-16 | 2016-07-20 | 中国科学院大连化学物理研究所 | Preparation method for electro-oxidation synthesis of one-dimensional nano-oxide structure |
| CN106582269A (en) * | 2016-11-24 | 2017-04-26 | 中国石油大学(华东) | Method for catalyzing ethane oxidation by using modified iron catalyst |
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| CN105780087A (en) * | 2014-12-16 | 2016-07-20 | 中国科学院大连化学物理研究所 | Preparation method for electro-oxidation synthesis of one-dimensional nano-oxide structure |
| CN106582269A (en) * | 2016-11-24 | 2017-04-26 | 中国石油大学(华东) | Method for catalyzing ethane oxidation by using modified iron catalyst |
| CN108727990A (en) * | 2018-05-15 | 2018-11-02 | 谭亚 | A kind of preparation method of stainless steel polishing wax |
| CN109054758A (en) * | 2018-06-21 | 2018-12-21 | 昆明理工大学 | A kind of preparation method of the high-temperature phase change heat accumulation material of core-shell structure |
| CN109054757A (en) * | 2018-06-21 | 2018-12-21 | 昆明理工大学 | A kind of preparation method of the Al@C composite phase change heat-accumulation material of core-shell structure |
| CN109054755A (en) * | 2018-06-21 | 2018-12-21 | 昆明理工大学 | A kind of core-shell structure Fe2O3-CeO2The preparation method of/(Al@C) the heat accumulating type carrier of oxygen |
| CN109054754A (en) * | 2018-06-21 | 2018-12-21 | 昆明理工大学 | A kind of core-shell structure Fe2O3-Al2O3The preparation method of/(Al@C) the high temperature composite phase-change heat-storage carrier of oxygen |
| CN109054754B (en) * | 2018-06-21 | 2020-10-27 | 昆明理工大学 | Core-shell structure Fe2O3-Al2O3Preparation method of (Al @ C) high-temperature composite phase-change heat-storage oxygen carrier |
| CN109054757B (en) * | 2018-06-21 | 2020-10-27 | 昆明理工大学 | Preparation method of Al @ C composite phase change heat storage material with core-shell structure |
| CN109054755B (en) * | 2018-06-21 | 2020-10-27 | 昆明理工大学 | Core-shell structure Fe2O3-CeO2Preparation method of heat storage type oxygen carrier |
| CN109054758B (en) * | 2018-06-21 | 2020-10-27 | 昆明理工大学 | Preparation method of high-temperature phase change heat storage material with core-shell structure |
| CN110734800A (en) * | 2018-07-20 | 2020-01-31 | 财团法人工业技术研究院 | Composite oxygen carrier, forming method thereof and oxidation-reduction reaction |
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